An environmental chemist is investigating the exothermic displacement reactions of various metals with an aqueous solution of copper(II) sulfate to establish their positions in the reactivity series.
The table below shows the temperature rise, in ∘C^{\circ}\text{C}∘C, recorded over four replicate runs for each metal.
| Metal | Temperature rise in ∘C^{\circ}\text{C}∘C (Run 1) | Temperature rise in ∘C^{\circ}\text{C}∘C (Run 2) | Temperature rise in ∘C^{\circ}\text{C}∘C (Run 3) | Temperature rise in ∘C^{\circ}\text{C}∘C (Run 4) | Mean temperature rise in ∘C^{\circ}\text{C}∘C |
|---|---|---|---|---|---|
| Zinc | 28 | 26 | 29 | 25 | 27 |
| Magnesium | 56 | 53 | 12 | 59 | XXX |
| Tin | 6 | 4 | 5 | 5 | 5 |
Calculate the mean temperature rise XXX for magnesium in the table.
Do not include the anomalous result in your calculation.
5 exam-style questions on AQA GCSE Chemistry 4.1 Reactivity of metals, covering 4.1.1 Metal oxides, 4.1.2 The reactivity series, 4.1.3 Extraction of metals and reduction, and 4.1.4 Oxidation and reduction in terms of electrons (HT only). Each one has a worked solution and a mark scheme showing where the marks go.